Method for mounting and rapidly and accurately positioning main tower cable guide pipe of cable-stayed bridge

Abstract

The invention discloses a method for mounting and rapidly and accurately positioning a main tower cable guide pipe of a cable-stayed bridge. The method comprises the following steps of S10, making a stiff skeleton segment and a positioning device and assembling the positioning device on the stiff skeleton segment; S20, preliminarily positioning a cable guide pipe on the stiff skeleton segment through the positioning device; S30, firmly welding the bottom of the positioned stiff skeleton segment and the top of a previous stiff skeleton segment of a main tower of the cable-stayed bridge; and S40, adjusting the cable guide pipe on the stiff skeleton segment through the positioning device, locking the positioning device and moving a saddle plate to stick to an outer wall plate of the lower part of the cable guide pipe; and fixedly welding the saddle plate and the stiff skeleton segment as well as the cable guide pipe and the saddle plate. According to the invention, the construction period can be prevented from being affected by twice separate lifting of the stiff skeleton segment and the cable guide pipe; the safety risks in aerial lifting operations are reduced; the construction difficulty of cable guide pipe positioning is reduced; the construction procedures are reduced; the working period is shortened; the construction operation is simple and convenient; the erection of a large working platform can be saved; and the construction period is shortened.

Description

technical field [0001] The invention is used in the technical field of bridge construction, and in particular relates to a cable-stayed bridge main tower cable guide installation and fast and accurate positioning method. Background technique [0002] With the large-scale construction of highway and railway transportation network in our country, the construction of long-span cable-stayed bridges appears more and more frequently. As an important load-bearing component of the cable-stayed bridge, the cable-stayed cable is the most important thing in the construction control of the cable-stayed bridge. The positioning accuracy requirements are very high, so the pre-embedded and accurate positioning of the inner cable guides on the main tower column has always been one of the key points and difficulties in the construction of cable-stayed bridges. [0003] Conventional method for the pre-embedded positioning construction of the upper tower column cable guide: the rigid frame and...

AI Technical Summary

Problems solved by technology

[0004] The rigid frame and the cable guide are hoisted separately and their positions are adjusted separately. The installation time is long, which affects the construction period, and two high-altitude hoistings are required, which increases the risk of safety control.

When the cable guide is installed, it is necessary to set up a large working platform in advance. For precise positioning, tools such as chain hoists and jacks are used to adjust the position of the cable guide. The adjustment tools are relatively heavy. The safety risk is relatively large, and when the jack is used for adjustment, the reaction seat needs to be welded first, and the process is relatively cumbersome, which affects the construction period

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